Ships – Mooring device – Boom type
Patent
1997-11-14
1999-03-23
Avila, Stephen
Ships
Mooring device
Boom type
114293, B63B 2100
Patent
active
058845763
DESCRIPTION:
BRIEF SUMMARY
This is a continuation of co-pending application PCT/US96/04997 filed Apr. 11, 1996.
This invention presents a new type of arrangement of mooring lines to be used primarily but not exclusively in Offshore Engineering. The invention is particularly suitable for use in Catenary Spread Mooring (CSM) systems and/or Taut Leg Spread Mooring (TLSM) systems including auxiliary systems used to moor Tension Leg Platforms (TLP) and any systems combining features of the above mentioned types of systems but it can also be used in any configurations distinct from the above specified.
The said new Mooring Arrangement can be used for anchoring or mooring any structure which can be floating at or away from a water surface or can be wholly or partly supported on firm ground, which includes the Sea Bed. It also includes any naturally non-consolidated entity which has been converted to be sufficiently firm by any artificial means like piling, injection of concrete, etc. In particular following types of structures can be mentioned with an understanding that the below are examples only and the list of types of structures to which the invention applies includes also other types of structures which might be not mentioned: Vessels, Offshore Platforms, buoys, Floaters, Articulated Columns, Offshore Towers including Guyed Towers, Semi Submersible Rigs, Tension Leg Platforms, Spars, Turrets, Structures used for Single Point or Multiple Point Mooring, and others. In particular, any vessels or floaters used for drilling and/or mining and/or any testing and/or any research activity and/or production and/or storage and/or depositing and/or loading and unloading of any materials that include storage and production of any hydrocarbon materials and/or any other materials are included here under the description of any vessels or/and floaters. The vessels or floaters can be in particular wholly or partly floating and wholly or partly directly or indirectly supported on any fixed ground. Any turrets or turret like structures that are connected to any other structure or structures by any fixed, adjustable or moveable means are also included here. Turrets or similar structures that can be placed wholly or partly above water level or under water level are also included here under the description of structures. All these mentioned or those not specifically mentioned structures can be wholly or partly moored with the use of the hereby described new mooring arrangement. This novel mooring arrangement is intended for use in very deep, deep and medium deep water in particular, but it can be also used in shallow water Mooring Systems.
The storage or depositing is meant here as storage or depositing onboard or outboard in any tanks or holds or any other arrangements that can be wholly or partly suspended in water or wholly or partly placed on the seabed or wholly or partly placed under the bottom of the sea, lake, river or any other natural or artificial area of a similar description.
CSMs and TLSMs are typically used for mooring Offshore Structures. The classification of such Systems and their Characteristics are widely described in Technical Literature, for example by D'Souza, Dove and Kelly in OTC 7203, Houston, 1993. Static and Dynamic and Hydrodynamic Characteristics of particular arrangements of Mooring Lines in particular and those of Complete Mooring Systems that incorporate the Mooring Lines are very important for operation of Mooring Systems and of Moored Structures in varying conditions throughout the Design Lives of the Systems. These Design Lives can be in specific instances brief for example limited by a functional requirement to carry out a specific task or some specific tasks. In many other instances the Design Life can be related to semi permanent or permanent mooring and can span for many years or several decades. The Design Life specified for any Mooring Arrangement in general and for a Mooring Arrangement being subject of this invention in particular can be specified as one of the above described extremes or by any intermediate set o
REFERENCES:
patent: 3111926 (1963-11-01), Shatto, Jr.
patent: 3434442 (1969-03-01), Manning
patent: 4067282 (1978-01-01), Guinn et al.
patent: 4889065 (1989-12-01), Van Den Haak
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